OFFSET
1,1
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 480*a(n-1) -60416*a(n-2) +1966080*a(n-3) +22020096*a(n-4) -1845493760*a(n-5) +22548578304*a(n-6) -68719476736*a(n-7)
EXAMPLE
Some solutions for n=2
..0..1..2..4..2....0..1..5..2..4....0..1..2..5..3....0..1..2..4..0
..2..4..2..1..3....5..3..5..3..4....5..4..3..1..3....3..4..5..4..5
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 05 2013
STATUS
approved